Best LoRa chip for Arduino & TTN

[bluejedi]

@simmoinard

Do you guys have any reccomendation for an easy chip to implement with Arduino mini pro, to communicate with things network ?

Not chip but modules. There are two different options:

1. Either SPI based where the LoRaWAN stack need to run on your MCU, or
2. A module with its own dedicated MCU for LoRaWAN, using AT commands over serial interface.

For SX127x and the Arduino framework there is actually only one good open source LoRaWAN library: MCCI LMIC.

ATmega32xx based boards can be used with MCCI LMIC but do not leave much room for larger sketches due to limited memory resources of the ATmega32xx.

@simmoinard

I really struggle to find good tutos

What is tutos? Do you mean tutorials?
Not a tutorial but a good and well documented example is: LMIC-node

@simmoinard

It could be great if they have low power mode

Achieving low-power with LMIC is possible but is not evident.